Effects of adding milk, sugar and artificial sweetener to total phenolic content and antioxidant activity of green tea powder (Camellia sinensis)

Hui, Kee Xiao (2021) Effects of adding milk, sugar and artificial sweetener to total phenolic content and antioxidant activity of green tea powder (Camellia sinensis). [Project Paper] (Submitted)

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Abstract

Camellia sinensis (green tea) is one of the popular functional foods worldwide, due to its strong antioxidant properties. The popularity of consuming sweetened milk tea keeps increasing nowadays. However, it was still controversial on the impact of adding milk, sugar and artificial sweetener to the antioxidant properties of tea and limited studies used green tea powder. Therefore, the present study was to investigate the effects of adding milk, sugar and sweeteners to the total phenolic content and antioxidant activity of green tea. Six green tea samples were prepared: Green tea powder (G), green tea powder with sugar (GS), green tea powder with aspartame (GA), green tea powder with milk (GM), green tea powder with milk and sugar (GMS) and green tea powder with milk and aspartame (GMA) were prepared by using matcha powder, full cream milk, white granulated sugar, and aspartame. The total phenolic content of green tea powder samples was evaluated by using Folin-Ciocalteu assay while α,α-diphenyl-2-picrylhydrazyl (DPPH) and ferric reducing antioxidant power (FRAP) assays were used to measure the antioxidant activity of samples. As a result, milk addition significantly enhanced the total phenolic content and antioxidant activity of green tea powder (p<0.05) but no significant effect was found between the sweetened green tea by using either sugar or aspartame (p>0.05). Strong and positive correlations were found between the total phenolic content and antioxidant activity of green tea powder by using DPPH (r=0.990) and FRAP assays (r=0.997). In short, it might be beneficial when milk is added to green tea as it could help to increase its antioxidant properties. No significant impact found in the sugar- or artificial sweetened green tea in this study. However, it is advised to add the sugar or artificial sweetener wisely to avoid any unfavourable effects.

Item Type:	Project Paper
Faculty:	Faculty of Medicine and Health Science
Depositing User:	Ms Norafizah Radzuan
Date Deposited:	04 Sep 2023 06:24
Last Modified:	04 Sep 2023 06:24
URI:	http://psaspb.upm.edu.my/id/eprint/1416

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